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<html lang="en">
	<head>
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		<meta name="viewport" content="width=device-width,initial-scale=1.0">
		<title>Document</title>
		<style>
			#box {
				width: 150px;
				height: 50px;
				float: left;
				margin-left: 30px;
				background: red;
				line-height: 50px;
				text-align: center;
			}
		</style>
		<script src="js/jquery-1.12.1.js"></script>
		<!-- <script src="js/ex50203.js"></script> -->
		<script>
			$(function() {
				var box = $("#box");
				box.html("我的爱国心");
			})
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	</head>
	<body>
		<div id="box">
			<span>我的中国心</span>
		</div>
	</body>
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